Prenylated chalcones, flavone and other constituents of the twigs of Dorstenia angusticornis and Dorstenia barteri var. subtriangularis |
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Authors: | Ngadjui Bonaventure T Watchueng Jean Keumedjio Felix Ngameni Bathélémy Simo Ingrid K Abegaz Berhanu M |
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Institution: | Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, BP 812, Yaoundé, Cameroon. bngadjui@uyc.uninet.cm |
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Abstract: | The twigs of Dorstenia angusticornis and Dorstenia barteri var. subtriangularis yielded 16 compounds. Two novel diprenylated chalcones: 3,5'-di-(2-hydroxy-3-methylbut-3-enyl)-4,2',4'-trihydroxychalcone, 3, 4-(2,2-dimethylpyrano)-3'-(2-hydroxy-3-methylbut-3-enyl)-2',4'-dihydroxychalcone and the known stipulin were isolated from both species. 3-(2-Hydroxy-3-methylbut-3-enyl)-5'-(3,3-dimethylallyl)-4,2',4'-trihydroxychalcone and the known compounds: 4-hydroxylonchocarpin, kanzonol B, bartericins A, B, C and 3'-(2-hydroxy -3-methylbut-3-enyl)-4,2',4'-trihydroxychalcone were isolated from D. barteri while the known compounds: gancaonin Q, paratocarpins C, F, and lupeol were obtained from Dorstenia angusticornis. beta-Sitosterol and its beta-d-glucopyranoside were isolated from both species. Structures of these secondary metabolites were established using spectroscopic analysis, especially, NMR spectra in conjunction with 2D experiments, COSY, HMQC and HMBC. |
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Keywords: | Dorstenia angusticornis Dorstenia barteri var subtriangularis Moraceae Twigs Isolation Prenylated chalcones Bartericins A-D Angusticornins A and B |
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